James dowson jackson



APPLICATION FILED SEPT-23 19.15-

PatentedSept. 2,1919.

rm! COLUMBIA ILANOGRAIII cm, WASIIINOTOK. u. c.

JAMES DOWSON JACKSON, 01? SYDNEY, NEW SOUTH WALES, AUSTRALIA.

OVEN PRINCIPALLY FOR DOMESTIC PURPOSES.

Application filed September 23, 1915.

To all whom it may concern:

Be it known that I, JAMES DOWSON JACK- SON, of 197 Hay street, Sydney, in the State of New South Wales, Commonwealth of Australia, master plumber, have invented certain new and useful Improvements in Ovens Principally for Domestlc Purposes, of which the following is a specification.

The present invention refers to ovens of the type having an isolated or non-contact heating chamber and has been specially devised to effect an improved oven of that type in which the disposition and arrangement of the flue passages the fire box and the outlet from said passages is so contrived that uniform heat distribution is effected about the heating chamber with economical heat consumption and moreover an oven of cheap and simple construction is also attained.

According to this invention the improved oven comprises essentially an isolated heating chamber surrounded by a bifurcated flue passage proceeding from a fire box positioned centrally below and from the front to the rear of said chamber to a common outlet disposed parallelly above and in the same vertical plane as the fire box. The outer wall of said flue passage is contained within the outer casing or shell of the oven and is preferably insulated from the same.

The said flue passage may be and is preferably vertically partitioned to form a plurality of passages all of which leadlfrom the said' fire box and communicate at the top with the flue outlet which box and outlet are common to all the flue The vertical partitioning state staggered formation to secure greater heating surface and effect baffling of the heat passin therethrough.

In t e preferred form and for best results the two members forming the bifurcated flue passage have a corresponding cross sectional area and the mouth of the fire box and of the entrance orifice to the flue exit have each a cross sectional area equal to the combined similar area of the said members.

To eliminate any excessive draft influence upon the bifurcated flue passage the chimney or other leading out flue of the oven at its point of communication with the oven flue is also in communication with the air.

In the drawing Figure 1 is perspective view of a complete domestic cooklng oven,

assages.

Specification of Letters Patent.

may progress in.

Patented Sept. 2, 1919.

Serial No. 52,231.

Fig. 2 is a vertical section on plane 22 of Fig. 1.

Fig. 3 is perspective view of a portion of the flue arrangement.

The heating or cooking chamber 8 of rectangular cross section extends practically the full depth of the oven outer casing 9 from the rear to the front walls of the latter and is isolated from the side and back walls of said casing 9 to provide the vertical and herizontal flue passages 13 and 14: respectively (see Fig. 2).

The outer wall 15 of these flue passages 13 and 141, which wall 15 is formed around all sides excepting the front of the chamber 8, is isolated from the side and rear walls of the oven casing 9 by insulation 17 of suitable material such as asbestos contained within chambers formed between the wall 15 and the outer casing 9.

This outer wall 15 of the flue passages 13 and 14 is so fitted that said passages are of equal cross sectional area throughout and constitute a bifurcated flue passage about the chamber 8 as shown in Fig. 2 both mem bers of the bifurcation (each member consisting of one of the vertical passages 13 and the adjoining half sections of the top and bottom horizontal flue passages 14) being of equal length and area and proceeding from a common fire box 20 at the junction of the bifurcation to a common flue exit 21 disposed parallel to and in a vertical plane above the fire box 20 (see Fig. 2).

The cross sectional area of the mouth of the fire box 20 and of the flue exit 21 are equal and the area of each of said mouths is equal to the combined cross sectional area of the vertical passages 13.

It is essential to provide in an oven, the disposition and length of the flue passages 13 and 14: the arrangement of the fire box 20 and flue exit 21 and the cross sectional area of the same as described in order to secure the maximum result from this invention, the exact structural arrangements illustrated and described herein not being es sential as same may be varied in design.

The vertical walls of the fire box 20 are formed by vertical terminations 22 of the outer wall 15 of the flue passages 13 and 14%. The heating element consists of the pipe or tubular gas burner, 23 of any approved form parallelly and centrally disposed between the walls 22 of the fire box 20 so that the flame from the burner is disposed in the central vertical plane (33 Fig. 1) of the chamber 8. The end of the pipe burner 23 closed, while its rear end is connected through the usual air mixing chamber 25 to the ipe 26 the supply to which latter is control ed in any known manner as by the valve 27 communicating with the oven main sup ply pipe 28.

The usual domestic oven fittings are shown applied to the construction illustrated and-consist of the chamber 29 for warming plates or for like purpose disposed above the chamber 8 and its flue exit 21, with the gas rings 30 and the grid top 31 which rings communicate with the main supply pipe 28 in the ordinary manner, such exterior fittings not forming part of this invention and being shown merely to depict a cooking oven which while embodying this invention is complete With existing forms of fittings.

The heat deflector plate 32 (see Fig. 2) is removably attached to the bottom of the chamber- 8 between the rails 33 and disposed in the vertical central line of the fire box 20.

The mouth of the flue exit 21 communicates With the main flue 34 through the damper controlled pipe 35 said flue 34 at its point of communication with the pipe 35 being alSO in communication with the atmosphere to prevent excessive draw or draft influence upon the oven flue passages 13 and 14. 7

The oven described is used with the flue passages about the chamber 8 of equal length and area and the mouth ofthe flue exit 21 and of the fire box 20 bothof equal area and the latter an area equivalent to the combined passages forming the bifurcated flue as reviously specified, the heat applied from t e common and centrally disposed fire box 20 uniformly distributes through the flue passages 13, the draft of Copies of this patent may be obtained. for five cents each, by addr ssing the Commissioner of riatgnts;

the oven having an equal effect upon each member of the bifurcated passage. forward or adjacent to the oven door 4 is When the oven chamber-8 is of large dimensions any tendency for the heat to travel diagonally to the main flue pipe 34 is counteracted by vertically dividing or partitioning the flue passages 13 and 14 as shown in Fig. 3, these vertical divisions not being, shown in Fig. 1 for the sake of clearness, and the plurality of flue passages 13 and 14 so formed may have lugs 37 alternately pro- -jecting from opposite partition surfaces.

What I claim and desire ters Patent is:

In an oven, the combination of an isolated heating chamberextending the entire length of theov'en, flue rpassages'coextensive with saidi'heating chamber and extending along ing the entire length of the oven and disposed centrally below the heating chamber and in a space forming the continuatlon of said flue passages, a vent chamber located tosecure by Let-.

the bottom walilgthe side walls and the top of said heating chamber, a fire "box extendher being equal to the combined cross-sectional areas of said flue passages, said flue passages terminating in said vent chamber, vertical partitions subdividing said flue pas sages in a plurality of compartments so as 'in presence of two i witnesses.

JAMES DOWSON J AGKSON. Witnesses: WALTER'rSIcMoND,

J. PARKER.

Washington, I). .0. 

